Laminated abrasive tool



June 24, 1947.

a. w. ALLRED' 2,422,876

wrm'rnn ABRASIVE TOOL Filed Jan. 5, 1945 2 snet -snm 1 June 24, 1947. G.'w. ALLRED 2,422,876

LAMINATED ABHASIVE TOOL Filed Jan. 5, 1945 2 Sheets-Sheet '2 Patented June 24,1947 b w x b I 2,422,876 a i LAMINATEDABRASIVE 'r'ooL George-WkAllred, MayodanQN.

' Application January s, 1945, Serial No. 571.418? f. r "rolaims. (01. 51-190) Y Thisv invention relates to abrasive tools of the one method; H b a type in which' a strip of-flexible sheet material siveedgeport'io of'thestripfor binding-succescarrying abrasivegrains on its surface is wound sive layers toget 'r' d a a I a plurality of turns to form a cylindrical wheel a 7 is'a sec ofair-abrasive tool showing which may be supported upon and rotated by an "another method arbor or a belt which may be supported upon and 5 sive edge-portion rotated by a plurality. ofrolls. The invention is v The strip ofabrasive sheet comprises a layer of employing thelintegral non-abr'a- .usingl the'integral non-abra-. I forybinding the layers together.

applicable also to abrasive discs and otherabra 1 abrasivematerial such as sand, emery or the like. v sive devices in which a plurality of layersof fleit secured; to a ileidble support such as paper, cloth ible abrasive are secured together. r 1 or the, like by "means of glue or other-suitable In my Patent No.2,363,739, I disclosed an abraw adhesive. In accordance with the invention, the

sive wheel formedby gluing non-abrasive strips support may-be'soft; compressible and resilient at the edges of the back of'the abrasivesheet and a such as cloth' haying' one side knapped, or felt securing the turnsof the abrasivesheet together by gluing together the free edges offlthe [1011, abrasive strips. This construction hasthe advan or a thick onjpa'per, like blotting paperwhich preferably has, asis common in blotting paper, a relatively hard and compact surfacelayer to tages that the turns of the. abrasive stripare held "which the-abrasive material is attached and a together without applying adhesive to} thabrasoft compressible and resilient base; layer. sive surfaces and the resulting tool has a veryde-f, sirable flexibility or softness due to the'fact; that the non-abrasive strips slightly space apartihe successive turns of the abrasive sheet. j 1

An object of the present invention is to provide abrasive tools formed of a plurality 'ofturns' 1 which is not coated with abrasive and which is or layers of abrasive sheet in whichthe use of jusedfor binding the layersofabrasive sheet tonon-abrasive strips glued to, the edges of the soft andresilient or ordinary paper or cloth such In accordance with my invention; the flexible .support for the abrasive, whether said supportis v as commonly is used in making sand and emery paper; has an integral edge portion or border gather. when the flexible support is soft and reabrasive sheet, as described in said patenhmls silient,theinon-abrasive edge portion thereof also avoided. a V b a a may be soft and resilient or this edge portion may A preferred embodiment of my present inven -be.relative1y hard and non-resilient like ordinary tion consists in an abrasive tool formed bysuper- 0 paper or cloth. Thus the edge portion may be left posing a plurality of layers of flexible sheet mateunknappedor the edge only of the soft resilient rial having an integral edge portion or border sheet may be coinpressed toa relatively thin,hard which is not coated with abrasive, the flexible compact layer or as in the case of paper having a sheet material or at least that portion thereof hard, compact front layer and a soft, compreswhich is coated with abrasive being yielding. or i 35. sible and resilient base layer, the latter-may be resilient. It is within the scope of my invention omitted or removed at the edge portions. 1

however to omit the resilient feature of the fiex- The ,edge portion of. the abrasive sheet may be ible support and to use paper or cloth such as plainasshown in Fig. 3 r notched as shown in commonly is used for sandpaper, emery cloth and Fig. 4, or merely cut asshown in Fig. 5 and, as is the like. a i 40 apparent, the non-abrasiveedge portion shown in The invention is illustrated in the accompany- Fig. 3.may be as wide ornarrow as desired, the

I ing drawing in which,

notches in theedge portion of. Fig. 4. may be of i Fig. 1 is afront elevation of an abrasive wheel any desired shape and distribution and the slits with a portion broken away to reveal a section or cutsin. the edge portion, Fig. 5, may be at right r thereof; angle to the axis of the strip or at any other suit- Fig. 2 is a front elevation of an abrasive belt; able angle. a a v I M Fig. 3 is a plan viewof the abrasive strip with It is to be understood that the abrasive strips integral non-abrasive edge portions; illustrated in Figs. 3, 4 and 5 may consist of a Fig. 4 is a plan view of an abrasive strip with layer ofabrasive on a flexible support, the entire the non-abrasive edge notched to facilitate bendwidth ofwhich is ordinary non-resilient paper or ing; fabric or the entire width of which is soft and Fig. 5 is a plan view of an abrasive strip with resilient or. that portion which is coated with the non-abrasive edge merely cut to facilitate abrasive materialmay be resilient and the nonbendlng; abrasive edge portions nonresilient.,

Fig. 6 is a section of an abrasive tool showing The particular structures illustratedinFigs. 6

angers are bent together and secured byadhesive. The resulting rough end" surface ofthewheel is covered and finished by the disc I which is secured. in place'by adhesive.

Fig. 2 shows the belt I made of a plurality of turns. of flexible abrasive sheet, carried on the rollers III, III. The upper span of the belt where pressure is applied in theme of the belt isbacked by the bed plate I l In Fig. 3, the non-abrasive'edges I of the.abrasive strip: are integral. and "whole, while 4- shows thenon-abrasive edgesprovidedwith 'aultj ably shaped and spaced. notches; l2, andm. .5

desired. glued thereto to serve as a covering like the disc I ofFig. 1. It will be understood further that the tool illustrated may be provided with a separate end disc 8, as in Fig, 1, glued to the layers of abrasive sheet to hold them together, and that the gluing of the inturned edges 1 of one layer to the back of the next layer may, in that case, be omitted, and the inturned edges then serving merely to provide the desired cushioning of the tool.

Fig. '7 shows another method of using the nonabrasive edges of the abrasive sheet to bind the turns or layers together and if desired to provide a cushioned tool. In the tool construction illustrated in this figure, the non-abrasive edges are bent back and folded under the abrasive portion of the strip to contact with the abrasive surface I of the next layer, but a portion of each non-abrashows the'noneabrasive edges provided with suitnon-resilient, or the abrasive portion resilient ably spaced anddirectedcuts'iil It will beunderstoodv that the abrasive strips illustrated in Flgs.3; 4' and 5 may beresilientor non-resilient in both the abrasive coated and edge portions, or resilient inthe abrasive coated and non-resilient in the edge portion. It will be understood further'that any of the strips illustrated in Figs. 3, 4 and 5 may be employed inthe'construction of the tools illustratedinFigs; 1 and 2. J

In Fig; 6. I? have illustrated a toolconstructlon in. which the. non-abrasive:integral etiges. I of y the abrasive strip are of a width substantially equal to the'width of: the abrasive portion of the stripand areturnedib'ackfover the abrasive lay- 7 er so as to form a covering therefor and a means for attachment to the non-abrasive face of the next layersor'turn of abrasive strip. Asillustrated inrFig. 6,the non-abrasive edges of thetop layer of abrasive sheet have been, removedto expose the-abrasive'surface, but the edges 'lof the second layer are tumedin and .glued-lto the back 1 sive edge is used to form the protruding loops or folds which are bent into contact and glued together at it to hold the layers of the abrasive tool together. "Ifheabrasive strip may be resilient or adhesive attachment between uncoated surfaces thereof.

2. An abrasive tool as defined in claim 1 in which the non-abrasive portion of each layer excepting the top layer is folded over the abrasive surface of the abrasive coated portion thereof between said abrasive surface and the non-abraof the to'p'layer-and. the edges 1' ofthethirdlayer are turned in and glued tothe back of the; second layer, and so on. In this. construction the layers are not held together by glue appliedto the abrasive surfacebut' by glue applied to the non-abrasive edges of the abrasive strip and to the back of the abrasive portion-.ofthe strip. In this con struction, the whole abrasivezstrip including the nonrabrasiveedges may be made of ordinary non-resilient paper or fabric, or the'whole strip may be. made of'resilient flexible sheet such as knapped fabric or felt or soft paper such as blott n paper, or the abrasive portion of the strip may be resilient and the non-abrasive edges non-' resilient, and the edges may be whole as illustrated; in Fig. 3 or notched as in- Fig. 4, or cut as illustrated in Fig. 5. The resulting tool, even if the entire strip is non-resilient will be somewhat cushioned due to the presence between the abrasive layers of the layer formed by the edges 1. This cushioning effectmay be amplifiedby mak ing either the edges orthe abrasive portion of the backing or both of resilient sheet material and/or by providing the edges 1 with perforations as shown inFig. 7.

It will be evident that the construction shown in Fig. 6 maybe used in a wheel, belt, disc or any other abrasive tool made up of a plurality of lay;

ers of abrasive sheet audit will also be evident,

that instead of simply tearing off the non-abid sive. edges of the top'layer, they may be folded -3. An abrasive tool'as defined in claim 1 in which the non-abrasive portion of each layer'is folded against'the non-abrasive surface of the abrasive coated portion thereof between said nonabrasive surface and the abrasive surface of the next layer.

4. An abrasive tool as defined in claim 1 in which the non-abrasive portion of each layer is folded along a line adjacent to but spaced apart from the edge of the abrasive coated portion to lie partially between the abrasive coated portion thereof and the abrasive coated portion of the next layer with the folded part of said non-abrasive portion adjacent said line lying outside the area .of superposed abrasive coated portions of said layers.

5. An abrasive tool as defined in claim 1 in which the non-abrasive portion of each layer excepting the top layer is folded over the abrasive surface of the abrasive coated portion thereof between said abrasive surface and the non-abrasive surface of the abrasive coated portion of the next layer, and the non-abrasive portion of each layer is adhesively attached to the non-abrasive surface of the abrasive coated portion of the next layer.

6. An abrasive tool as defined in claim 1 in which the non-abrasive portion of each layer is folded along a line adjacent to but spaced apart from the edge of the abrasive coated portion to lie partiallybetween the abrasive coated portion abrasive portions adhesively attached to each v other. i

7. An abrasive tool as defined in claim 1 in which the non-abrasive portions or at least part of the layers are folded between the successive layers of the abrasive coated portions thereofand said non-abrasive portions are perforated to impart softness and resilience thereto.

GEORGE W. AiLRED.

6 anrnaanons orrnn The following references are of record in the file oi this patent:

Number UNITED STATES PATENTS Name Date Ailred Nov. 14, 1944 Smith Feb. 7, 1933 Hanson Jan. 6, 1925 Heyer Apr. 5, 1932 Lippitt Mar. 1. 1938 Ballet al. "-1 Dec. 7, 1943 

